I agree that the food at California Grill is amazing, but I also love the Crystal Palace. Personally, I love spending the last night in MK, surrounding by that Disney ambiance. California Grill is close enough to walk to from MK, so that is a good option.
CG is better food and a great view of Disney and beyond.
CP is good food, don't have to leave the park, and really fun characters.
Either is a good choice in my opinion.